92 T. H. MORGAN. 



experiments of causing it to develop out of water, but this 

 does not show that if water is removed beyond a certain point or 

 the capacity to absorb water is changed the development might 

 not be delayed. In fact if the egg is dried too much it fails to 

 develop. However this may be, the point of special interest 

 brought out by these experiments is that an effect may be pro- 

 duced by a double solution in which the total osmotic pressure 

 is lower than that required to produce the effect by one of the 

 substances alone, but higher than that sufficient to produce the 

 result by the other alone. It seems probable that the effect is a 

 double one ; in part chemical, in part osmotic. 



